The interviewer knows it anyway. So it is best if you send a mail about your mistake and how to correct it. Think about it that way, if you are working with someone, would you like to have him/her figure out and correct their mistakes themselves, or you want to work with someone who needs baby-sitting all the time.
After Jailbreak,unlock through cydia. You need change the Ipone setting for Tmobile. ISO4.21 & baseband 6.15 should work for Tmobile. Turn off 3G because Tmobile using EDGE update the iPhone configuration to T-Mobile specific carrier settings: •Tap on “Settings” then “General” then to “Network” and “ Cellular Data Network” •Enter in the following T-Mobile specific settings under Cellular Data, MMS, and Internet Tethering: •APN: internet2.voicestream.com (use wap.voicestream.com or epc. tmobile.com if the first fails) •MMSC: 216.155.174.84/servlets/mms •MMS Proxy: 216.155.165.50:8080 •Leave all other fields blank •Exit Settings http://www.youtube.com/watch?v=C4Z7p8cRKTI